Send updating image to rtmp with ffmpeg in flutter app - flutter

Question

I have a JPG image in a directory that I update each time I got a new one and I have to send this image to a rtmp server.
I fond that ffmpeg can do that but I thougt -loop 0 is suppose to loop over the image and see if it is refreshed but when I start my command inside my app it seem to start well and end with good Return Code (0) but don't seem to loop.
Here is my ffmpeg command : '-re -loop 0 -i $pathToFile -preset ultrafast -tune zerolatency -c:v libx264 -f flv $streamUrl'
This code execute the command :
FFmpegKit.executeAsync(command, (session) async {
if (ReturnCode.isSuccess(await session.getReturnCode())) {
log('FFmpeg process exited with rc ${await session.getReturnCode()} in ${await session.getDuration()} milliseconds');
} else if (ReturnCode.isCancel(await session.getReturnCode())) {
log('FFmpeg process cancelled');
} else {
log('FFmpeg process failed with rc ${await session.getReturnCode()} in ${await session.getReturnCode()} milliseconds');
}
}, (session) {
log('Message ${session.getMessage()}');
}, (session) {
log('Statistics ${session.toString()}');
});
And finally I got those logs :
[log] Message [libx264 # 0x7ccd0b6400] 264 - core 164 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=7 lookahead_threads=7 sliced_threads=1 slices=7 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
[log] Message Output #0, flv, to 'rtmp://stream.stream.url.com':
[log] Message Metadata:
[log] Message encoder :
[log] Message Lavf59.27.100
[log] Message
[log] Message Stream #0:0
[log] Message : Video: h264 ([7][0][0][0] / 0x0007), yuvj422p(pc, bt470bg/unknown/unknown, progressive), 640x480, q=2-31
[log] Message ,
[log] Message 25 fps,
[log] Message 1k tbn
[log] Message
[log] Message Metadata:
[log] Message encoder :
[log] Message Lavc59.37.100 libx264
[log] Message
[log] Message Side data:
[log] Message
[log] Message cpb:
[log] Message bitrate max/min/avg: 0/0/0 buffer size: 0
[log] Message vbv_delay: N/A
[log] Message
[log] Statistics Instance of 'Statistics'
[log] Message frame= 1 fps=0.0 q=20.0 size= 21kB time=00:00:00.00 bitrate=173704.0kbits/s speed= 333x
[log] Message [flv # 0x7cf7f74d00] Failed to update header with correct duration.
[log] Message [flv # 0x7cf7f74d00] Failed to update header with correct filesize.
[log] Statistics Instance of 'Statistics'
[log] Message frame= 1 fps=0.0 q=20.0 Lsize= 21kB time=00:00:00.00 bitrate=173864.0kbits/s speed=0.0204x
[log] Message video:21kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.513382%
[log] Statistics Instance of 'Statistics'
[log] Message frame= 1 fps=0.0 q=20.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=0.0204x
[log] Message video:21kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[log] Message [libx264 # 0x7ccd0b6400] frame I:1 Avg QP:20.00 size: 20815
[log] Message [libx264 # 0x7ccd0b6400] mb I I16..4: 100.0% 0.0% 0.0%
[log] Message [libx264 # 0x7ccd0b6400] coded y,uvDC,uvAC intra: 37.5% 22.7% 2.3%
[log] Message [libx264 # 0x7ccd0b6400] i16 v,h,dc,p: 50% 14% 24% 12%
[log] Message [libx264 # 0x7ccd0b6400] i8c dc,h,v,p: 78% 6% 15% 1%
[log] Message [libx264 # 0x7ccd0b6400] kb/s:4163.00
[log] FFmpeg process exited with rc 0 in 562 milliseconds
All of this in inside a Flutter app with the package ffmpeg_kit_flutter (the full gpl version of it).
Any one have an idea of how to loop over constantly every time the image is updated ?
Edit : I try adding -f image2 in input but it failed with :
[log] Message ffmpeg version n5.1.2
[log] Message Copyright (c) 2000-2022 the FFmpeg developers
[log] Message
I/ink.kw_deliver(30445): WaitForGcToComplete blocked ProfileSaver on HeapTrim for 28.215ms
[log] Message built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
[log] Message configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libdav1d --enable-libkvazaar --enable-libx264 --enable-libxvid --enable-libx265 --enable-libvidstab --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-libzimg --disable-openssl --enable-zlib --enable-mediacodec --enable-gpl
[log] Message libavutil 57. 28.100 / 57. 28.100
[log] Message libavcodec 59. 37.100 / 59. 37.100
[log] Message libavformat 59. 27.100 / 59. 27.100
[log] Message libavdevice 59. 7.100 / 59. 7.100
[log] Message libavfilter 8. 44.100 / 8. 44.100
[log] Message libswscale 6. 7.100 / 6. 7.100
[log] Message libswresample 4. 7.100 / 4. 7.100
[log] Message Input #0, image2, from '/data/user/0/com.kwikwink.kw_delivery/cache/images/stream.jpg':
[log] Message Duration:
[log] Message 00:00:00.04
[log] Message , start:
[log] Message 0.000000
[log] Message , bitrate:
[log] Message N/A
[log] Message
[log] Message Stream #0:0
[log] Message : Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 640x480
[log] Message ,
[log] Message 25 fps,
[log] Message 25 tbr,
[log] Message 25 tbn
[log] Message
[log] Message rtmp://stream.path.com: I/O error
[log] FFmpeg process failed with rc 1 in 1 milliseconds